Can be a bad laser unit. Is it brand new? If so , you may still have a warrenty on it. Or did you buy the extra coverage on it. If you did call for service. Most people forget they did get the extra coverage. Look at your paper work.. It may be coastly to fix..

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You should have a PDF Owner's manual on the software install disk. Troubleshooting section should say what the error is and what to do to fix. Or try this:
http://printcopy.info/?l=en&mod=free&chap=erc&brand=Canon&model=iR1020

Polygon mirror motor error/lock. Unplug the copier. Wait 20 seconds. Plug it back in. See if that makes it go away.

Otherwise you should get a hold of a service technician but getting parts for a 250 is very tough. It could be the polygon motor, the power supply, a cable, or a board. It will take some time to troubleshoot.